RelativeLayout rl = new RelativeLayout(this);
    LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    rl.setLayoutParams(params);
    Button button = new Button(this);
    button.setText("Previous");
    LayoutParams params1 = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    params1.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
    button.setLayoutParams(params1);
    rl.addView(button);